{% extends '__base__.html' %}

{% block title %}Math problem 4-Jack's web app{% endblock %}

{% block content %}
<h3>Problem4</h3>
<p>供题:Mr.Lu</p>
<p>已知a,b,c为整数，0≤a≤10，0≤b≤10，0≤c≤10，10≤a+b+c≤20。则满足条件的有序数组(a,b,c)共有多少对?</p>
<textarea class="answer" placeholder="write here..."></textarea>
{% endblock %}